It looks, at least from the outside, a lot like my house. MIne was built in 75. Not quite sure how big the basement is, but it must be completely finished too. My house is roughly the same size by the looks of it - and every other house in the neighborhood - and is only about 1300 sq feet and the basement was almost completely finished. There was one utility room that wasn't finished. My basement is only about 1000 sq feet, it doesn't go under my kitchen or carport.
Hopefully - as long as I can get back on my feet in the next couple months - I'll have my house appraised later this year to get financing for my garage build and other stuff. Like I said, I hope they sell it for that price to increase my property value, but I think it's a bit high.